Air Suspension System for 1955-1957 Chevy Car w/ 1 piece frame.

Includes front & rear HQ Series ShockWaves, upper & lower StrongArms, Bolt-On 4-Link and front MuscleBar.

On 1955, 1956 and 1957 cars, how do I tell the difference between 1 and 2 piece frames?
Look at the bottom of the main frame rail under the driver’s door area. On 1-piece frame cars the bottom of the frame will be  flat and smooth. This frame is often called the "California" frame. The 2-piece frame design has a rough weld seam right down the bottom center of the frame rail front to rear.